Pentax-Q vs Oly PEN Mini

"The Olympus PEN E-PM1 is billed as the smallest and lightest of the company's PEN-series camera models, as of late June 2011, and we'd believe it. While its svelte metal body doesn't quite reach into the same territory as the recently-announced Pentax Q, that's hardly surprising, given that it sports a sensor with roughly eight times the surface area. That it even comes close to the size of Pentax's competitor given the huge disparity in sensor size shows how much effort Olympus has put into reducing size and weight.

Overall, when compared to the Pentax Q, the Olympus PM1 is approximately 12 millimeters wider, 6mm taller, and 3mm thicker than the Pentax camera, and 67 grams (approx. 34%) heavier when loaded and ready to go, but without a lens attached."